Multiple calculations can be selected and deleted. A dialog box is invoked to confirm the deletion of the calculations based on one of two conditions.

 

 

If you are viewing the details of a calculation using the Calculation Editor and the calculation is deleted, then the following dialog box is invoked:

The dialog box has the following items:

A calculation can be selected and inhibited through the Inhibit… menu option. A calculation cannot be inhibited if it has any of the following quality codes:

When you inhibit a calculation the following dialog box is invoked:

The dialog box consist of the following items:

Once the calculation is inhibited, its value will no longer be updated until the inhibit operation is removed. If the calculation is associated with a SCADA measurement (the calculation writes its value back to the SCADA measurement), then the SCADA measurement will also appear as inhibited in the SCADA Summary.

If you view the details of the inhibited calculation, the details are displayed in view only mode until the inhibit operation is removed.

The Comment, Who, and Comment Timestamp columns in the Calculation Summary are updated with the reason supplied in the dialog box, the operator who applied the inhibit operation, and the time the operation was applied.

The quality of the calculation is set to Inhibit.

Once the calculation is inhibited you can perform the following actions on it:

A calculation can be selected and a value manually entered through the Manual Entry… menu option. A calculation cannot be manually entered if it has any of the following quality codes:

When you apply a manually entered value to a calculation, the following dialog box is invoked:

The dialog box consist of the following items:

Once the value of a calculation is manually entered its result will be updated to the manual value. Any calculation that references it will use the manually entered value when evaluating its own value.

The manual value is automatically cleared the next time any of the calculations dependencies are updated.

If the calculation is associated with a SCADA measurement (the calculation writes its value back to the SCADA measurement), then the SCADA measurement will also appear as manually entered in the SCADA Summary.

The quality of the calculation is set to Manual.

Once the calculation is manually entered, you can perform the following actions on it:

A calculation can be selected and a value manually overridden through the Manual Override… menu option. A calculation cannot be manually overridden if it has any of the following quality codes:

 

When you apply a manually override to a calculation the following dialog box is invoked:

 

The dialog box consist of the following items:

Once the calculation is manually overridden, its value will no longer be updated until an inhibit operation or manual override is removed. If the calculation is associated with a SCADA measurement (the calculation writes its value back to the SCADA measurement), then the SCADA measurement will also appear as manually overridden in the SCADA Summary.

If you view the details of the manually entered calculation, the details are displayed in view only mode until the inhibit operation or manual override is removed.

The Comment, Who, and Comment Timestamp columns in the Calculation Summary are updated with the reason supplied in the dialog box, the operator who applied the manual override operation, and the time the operation was applied.

The quality of the calculation is set to Override.

Once the calculation is manually entered you can perform the following actions on it:

You can cancel an inhibit operation on a calculation if it is inhibited or manually overridden. Canceling an inhibit operation on an inhibited calculation shall return the calculation to its real‑time value. Canceling an inhibit operation on a manually overridden calculation shall make the calculation manually entered. The calculation shall retain its manual value until the next time one of its dependencies is updated.

You can cancel a manually entered operation on a calculation if it is manually entered. Canceling the manual entry shall return the calculation to its real-time value.

You can cancel a manually override operation on a calculation if it is manually overridden. Canceling the manual override shall return the calculation to its real-time value.

The Variables Summary provides a list of all variables in the system. A variable is a calculation whose value is not associated with a device. Variables are typically used to hold common constant values or global values that are referenced by other calculations and variables. Both variables and calculations use the Calculation Editor when creating new or updating existing variables or calculations. Many of the operations that can be performed on a calculation can also be performed on a variable.

 

The Variable Summary consists of four parts:

 

 

The Quality Summary provides a count of the number of variables categorized into quality. The summary displays a count of all variables in the system. The counts are independent of any additional filtering currently selected in the Variable Summary Table or Variable Summary Filters or any truncation as a result of the MaxCalculationsToFetch Event Management Rule.

The summary displays the following information:

The Variable Summary Table contains all the variables in the system. The table displays the following information:

The Variable Summary Table will be truncated if too many rows are fetched from the server. The maximum number of variables that can be fetched is controlled by the MaxCalculationsToFetch Event Management Rule and defaults to 2000 rows.

The Variable Summary provides a set of global filters that can be applied to the contents of the Variable Summary Table. For the full list of available filters see The Calculation Summary Filters.

The Calculation Editor is used to view, update, or create new calculations or variables.

 

The Calculation Editor consists of the following parts:

The calculation title is shown in the Calculation Editor title and in the tab name. If you modify the details of a calculation but have not yet saved the calculation, then the calculation title adds an asterisk character to indicate that there are unsaved changes.

 

 

The Search Box allows you to quickly locate search text in the calculations definition by highlighting the text. For example:

The search box can automatically highlight open and closing brackets (), or open and closing hard references [] or open and closing soft references {} by just searching for the open bracket (, open hard reference [ or open soft reference {.

The Calculation Details displays name, id and other properties of the calculation or variable. Based on whether a calculation or variable is being edited the details are slightly different.

The calculation details contains the following information:

 

The Periodicity is only applicable when the Trigger is set to Periodic or On Change and Periodic and is not enabled when the Trigger is set to On Change.

The Periodicity combo box has a blank entry. If this blank entry is selected then the Trigger automatically updates to On Change. Likewise if the trigger is updated to On Change the Periodicity is automatically cleared.

Within the calculation definition you can reference the value of other calculations or SCADA measurements. The calculation or measurement can be a Hard [] or Soft {} reference. If an object is a Hard reference then its value changing will trigger a recalculation of this calculations value. If an object is a Soft reference then a change in its value will not trigger a re-evaluation. If you select to make the Trigger value Periodic the Calculation Engine will automatically change all Hard references to Soft references. Note changing the Trigger value back will not revert the Soft references back to Hard references and the references must be modified by hand.